DE2933141B2 - Verankerungszapfen für ein nagelartiges Gleitflächen-Implantat - Google Patents
Verankerungszapfen für ein nagelartiges Gleitflächen-ImplantatInfo
- Publication number
- DE2933141B2 DE2933141B2 DE2933141A DE2933141A DE2933141B2 DE 2933141 B2 DE2933141 B2 DE 2933141B2 DE 2933141 A DE2933141 A DE 2933141A DE 2933141 A DE2933141 A DE 2933141A DE 2933141 B2 DE2933141 B2 DE 2933141B2
- Authority
- DE
- Germany
- Prior art keywords
- pin
- conical
- anchoring
- anchoring pin
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30756—Cartilage endoprostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
- A61F2/3603—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices implanted without ablation of the whole natural femoral head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/064—Surgical staples, i.e. penetrating the tissue
- A61B17/0642—Surgical staples, i.e. penetrating the tissue for bones, e.g. for osteosynthesis or connecting tendon to bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/064—Surgical staples, i.e. penetrating the tissue
- A61B2017/0647—Surgical staples, i.e. penetrating the tissue having one single leg, e.g. tacks
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
-
- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30749—Fixation appliances for connecting prostheses to the body
-
- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
- A61F2/389—Tibial components
-
- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30112—Rounded shapes, e.g. with rounded corners
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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Description
Die Erfindung betrifft einen Verankerungszapfen für ein nagelartiges Gleitflächen-Implantat für ein menschliches
Gelenk mit einer zahnartigen Oberflächenstruktur.
Bei der zementfreien oder zumindest zementarmen Verankerung von Implantaten in menschliche Knochen
ergeben sich häufig Schwierigkeiten mit der Fixierung während der ersten Wochen nach der Implantation, bis
durch An- und/oder Einwachsen von Gewebe eine ausreichende Fixierung erreicht ist. Diese Schwierigkeiten
treten besonders bei platten- oder schalenartigen Implantaten auf, die beispielsweise lediglich beschädigte
oder zerstörte Knorpelschichten der Gleitflächen in menschlichen Gelenken ganz oder teilweise ersetzen.
Denn bei diesen Implantaten müssen die für eine zementfreie Verankerung bestimmten Zapfen, die
entweder eingeschlagen oder eingeschraubt werden, sowohl in der relativ dünnen und kompakten äußeren
Knochenschicht, der Kortikalis, als auch in dem etwa eine 20fach geringere Dichte aufweisenden, spongiösen
Gewebe fest verankert sein.
Es ist beispielsweise aus der DE-OS 25 49 819 bekannt, Verankerungsschäfte und/oder -zapfen von
Implantaten, besonders von Endoprothesen mit einer Verzahnung zu versehen, um die Haftung der
Implantate im Knochen zu verbessern. Da jedoch derartige Implantate im allgemeinen nur in die
Spongiosa von operativ vorbereiteten Röhrenknochen eingesetzt werden, treten bei ihnen die vorstehend
geschilderten Schwierigkeiten bei einer Verankerung in kortikalem und gleichzeitig in spongiosem Gewebe
nicht auf, wie sie bei als Knorpelersatz dienenden Implantaten gegeben ist
Aufgabe der Erfindung ist es, einen Verankerungszapfen zu schaffen, der diesen erheblichen Verschieden-
heiten des kortikalen und des spongiösen Knochengewebes Rechnung trägt und die Verankerung eines
Implantates in Kortikalis und Spongiosa verbessert Erfindungsgemäß wird diese Aufgabe dadurch gelöst,
daß der Verankerungszapfen in einem oberen Bereich seiner Länge einer konische Grundform beliebigen
Querschnitts mit einer mindestens auf einem Teil des Umfangs verlaufenden Feinverzahnung aufweist und
daß der vom konischen Bereich zum freien Ende des Zapfens verlaufende Bereich eine Grundform beliebigen
Querschnitts mit zu ihrer Längsachse paralleler Manteilinie aufweist, und mindestens mit einer, über
mindestens einen Teil des Umfangs verlaufenden Grobverzahnung versehen ist.
Die Querschnitte der Grundformen der beiden Zapfenbereiche können dabei kreisrund, elliptisch oder
polygonförmig, z. B. 3-, 4- oder mehreckig, sein; es sind dafür aber auch ovale oder andere, nicht einer einfachen
geometrischen Fläche entsprechende Querschnittsflächen denkbar.
Für die Anwendung des neuen Verankerungszapfens wird bei der Verankerung der Gleitflächenimplantate —
nach Entfernen der beschädigten und daher zu ersetzenden Knorpelschicht-, beispielsweise zunächst
mit Hilfe eines Formbohrers, der in Größe und Form den Grundformen der beiden Zapfenbereiche entspricht,
der Knochen angebohrt und anschließend der Zapfen eingeschlagen oder gegebenenfalls eingeschraubt.
Die Grobverzahnung des in die Spongiosa eindringenden Zapfenbereichs verdrängt dabei aufgrund
ihrer gegenüber dem Volumen der Grundform relativ stark vergrößertem Volumen beim Einschlagen
des Zapfens relativ viel des die ausgebohrte Grundform umgebenden Gewebes und verdichtet dieses dabei,
wodurch bekanntlich das Einwachsen des Zapfens beschleunigt und verbessert wird. Wegen der größeren
Dichte der Kortikalis ist dieser Effekt im kortikalen Gewebe wesentlich geringer. In dieses dringt daher nur
das erheblich geringere Volumen — bezogen auf das zugehörige Grundvolumen — der im konischen Bereich
so vorhandenen Feinverzahnung ein. Die konische Formgebung ist dabei erforderlich, weil anderenfalls das
Volumen des »zylindrischen« Bereichs, der die Grobverzahnung trägt, beim Einschlagen einen beträchtlichen
Teil des am Rand der Grundformbohrung benachbarten kortikalen Gewebes zerstört, so daß darin
die Haftung des Zapfens nicht mehr gewährleistet ist.
Andererseits ergäbe eine durchgehend konische Form im Bereich des freien Zapfenendes eine zu geringe
mechanische Festigkeit der Grundform gegenüber den relativ groben Zähnen, wenn die Abmessungen des
Zapfens — im Verhältnis zu den zugehörigen Implantaten — nicht zu groß werden sollen.
Die konische Grundform im kortikalen Bereich des Körpers hat darüberhinaus noch den weiteren Vorteil,
daß gegenüber einer »zylindrischen« Grundform die Auflagefläche und die mechanische Festigkeit, besonders
gegenüber Biegebeanspruchungen, vergrößert werden.
In den Unteransprüchen sind vorteilhafte Ausgestaltungen der Erfindung hinsichtlich der Bemessung der
einzelnen Zapfenbereiche relativ zueinander niedergelegt. Als Materialien für die neuen Verankerungszapfen
bzw. für die mit ihnen versehenen Implantate eignen sich alle auf dem Gebiet der Implantat-Technik üblichen
Stoffe, wie Metalle, Metallegierungen, Biokeramik, pyrolytischer Kohlenstoff und Kunststoffe, insbesondere
Polyäthylen der Qualifikationen HDPE und UHMW.
Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels im Zusammenhang mit der Zeichnung
näher erläutert.
F i g. 1 zeigt schematisch einen Femurkopf, in den eine Reihe von mit dem neuen Verankerungszapfen
versehene Gleitflächen-Implantate eingeschlagen sind,
wobei eines der Implantate im Schnitt dargestellt ist,
Fig.2 ist eine vergrößerte Darstellung eines der Gleitflächen-Implantate nach Fig. 1, das in eine
Knorpelschicht eingelassen und im darunter liegenden Knochen verankert ist.
Im Fermurkopf 1 (Fig. 1) sind eine Reihe von
nagelartigen Gleitflächen-Implanteten 2 vorgesehen, die als prothetischer Ersatz für zerstörte Teilbereiche
der Knorpelschicht 3 (Fig.2) dienen. Ihre Verankerungszapfen 4 sind, wie bereits kurz geschildert, in
Bohrungen des entsprechend vorbereiteten Knochens eingeschlagen.
Die Grundform des Verankerungszapfens 4 jesteht in einem dem Kopf des Implantatnagels 2 nahen oberen
Teil aus einem konischen Bereich 5, dessen Länge im wesentlichen der Dicke der Kortikalisschicht 6 des
Knochens entspricht. An die konische Grundfoim schließt sich dann zum freien Ende des Zapfens 4 hin ein
Bereich 7 mit einer »zylindrischen« Grundform an, deren »erzeugende« Mantellinie parallel zu ihrer
Längsachse verläuft. Die Grundform des Bereichs 7 kann dabei einen beliebigen Querschnitt aufweisen, der
im einfachsten Fall kreisförmig ausgebildet ist.
Im Bereich 5 trägt die konische Grundform eine relativ feine Verzahnung 8, die beim Einschlagen nur
wenig in das kortikale Gewebe 6 eindringt, jedoch mit ihren feinen Zähnen in dieses Gewebe widerhakenartig
eingreift, so daß ein Herauswandern aus dem Gewebe 6 entgegen der Einschlagrichtung sicher verhindert wird.
Der Bereich 7 des Zapfens 4 ist bei eingeschlagenem Implantat in dem spongiösen Gewebe 9 verankert; er ist
daher mit mindestens einem — im gezeigten Beispiel jedoch mehreren — relativ voluminösen und groben
Zähnen 10 versehen, deren Volumen mindestens etwa 20% des Volumens der zugehörigen Grundform 7
ίο beträgt Die Zähne 10 haben die Aufgabe, beim
Einschlagen des Zapfens 4 spongiöses Gewebe zu verdrängen, das sich in komprimierter Form jeweils in
der »Einkerbung« hinter dem vorausgehenden Zahn 10 ablagert.
Wie F i g. 2 erkennen läßt, ist der zylindrische Bereich 7 an der Übergangsstelle 11 gegenüber dem konischen
Bereich 5 stufenförmig abgesetzt Diese Stufe 11 hat den
Zweck, den kleinsten Enddurchmesser des konischen Bereichs 5 mindestens so groß zu machen, daß die
Zähne 10 des zylindrischen Bereichs 7 die konische Grundformbohrung in der Kortikalis beim Einschlagen
praktisch frei, d. h. möglichst ohne kortikales Gewebe 6 zu beschädigen, durchdringen. Diese freie Durchdringung
der KortiKalis läßt sich beispielsweise auch durch
einen größeren öffnungswinkel für den Konus des konischen Bereichs erreichen; dieser wird jedoch im
Bereich zwischen 2 und 30" gehalten.
Die feine Verzahnung 8 hat, bezogen auf ihre konische Grundform 5, deren Länge mit Vorteil
praktisch mit der Dicke der kortikalen Gewebeschicht 6 übereinstimmt, ein relativ geringes Volumen, das nur
wenige Prozent des Grundformvolumens 5 beträgt. Die durch sie ausgelöste Gewebeverdrängung in der
Kortikalis 6 ist daher erheblich geringer als diejenige in der Spongiosa. Die Dichteunterschiede zwischen
kortikalem und spongiösem Gewebe, die bekanntlich etwa 20:1 betragen, kann man in etwa bei der
Bemessung der Volumina der Zähne 8 und 10 berücksichtigen, wenn das Verhältnis dieser Volumina
zueinander mindestens 1 :10 oder kleiner, mit Vorteil
besonders ebenfalls etwa 20 :1, ist.
Hierzu 1 Blatt Zeichnungen
Claims (6)
1. Verankerungszapfen für ein nagelartiges Gieilflächen-lmplantat für ein menschliches Gelenk
mit einer zahnartigen Oberflächenstruktur, dadurch gekennzeichnet, daß der Verankerungszapfen
(4) in einem oberen Bereich seiner Länge eine konische Grundform (5) beliebigen Querschnitts mit einer mindestens auf einem Teil des
Umfangs verlaufenden Feinverzahnung (8) aufweist, und daß der vom konischen Bereich zum freien Ende
des Zapfens (4) verlaufende Bereich (7) eine Grundform beliebigen Querschnitts mit zu ihrer
Längsachse paralleler Mantellinie aufweist, und mindestens mit einer. Ober mindestens einen Teil des
Umfangs verlaufenden Grobverzahnung (JO) versehen ist
2. Verankerungszapfen nach Anspruch 1, dadurch gekennzeichnet, daß das Gesamtvolumen des die
Grobverzahnung (10) tragenden Zapfenbereichs (7) zu demjenigen des konischen Bereichs (5), jedes
bezogen auf das zugehörige Grundformvolumen, mindestens 10:1 beträgt
3. Verankerungszapfen nach Anspruch 2, dadurch gekennzeichnet, daß das Verhältnis der Volumina
der beiden Zapfen-Bereiche 20 :1 beträgt.
4. Verankerungszapfen nach Anspruch 1, dadurch gekennzeichnet, daß der konische Bereich (5) 1/10
bis 1/2 der Gesamtlänge des Zapfens (4) beträgt und eine Länge von 0,3—5 mm aufweist.
5. Verankerungszapfen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der öffnungswinkel
des konischen Bereichs (5) 2 bis 30° beträgt.
6. Verankerungszapfen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens eine
der Verzahnungen (8 bzw. 10) als Gewinde ausgebildet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1039078A CH632923A5 (en) | 1978-10-06 | 1978-10-06 | Implant for partial replacement of a sliding surface of a human joint |
CH1039178A CH632922A5 (en) | 1978-10-06 | 1978-10-06 | Anchorage pin for bone implants |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2933141A1 DE2933141A1 (de) | 1980-04-10 |
DE2933141B2 true DE2933141B2 (de) | 1981-03-12 |
DE2933141C3 DE2933141C3 (de) | 1981-12-17 |
Family
ID=25706591
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2933141A Expired DE2933141C3 (de) | 1978-10-06 | 1979-08-16 | Verankerungszapfen für ein nagelartiges Gleitflächen-Implantat |
DE19792933174 Pending DE2933174A1 (de) | 1978-10-06 | 1979-08-16 | Implantat fuer einen teilweisen ersatz einer gleitflaeche eines menschlichen gelenkes |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19792933174 Pending DE2933174A1 (de) | 1978-10-06 | 1979-08-16 | Implantat fuer einen teilweisen ersatz einer gleitflaeche eines menschlichen gelenkes |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT370989B (de) |
CH (2) | CH632922A5 (de) |
DE (2) | DE2933141C3 (de) |
Cited By (1)
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DE4300039C1 (de) * | 1993-01-04 | 1994-06-09 | Imz Fertigung Vertrieb | Befestigungsnagel und Setzwerkzeug hierfür |
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DE923383C (de) * | 1951-08-08 | 1955-02-10 | Frans Donatus Dr Me Timmermans | Zweistoff-Endoprothese |
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-
1978
- 1978-10-06 CH CH1039178A patent/CH632922A5/de not_active IP Right Cessation
- 1978-10-06 CH CH1039078A patent/CH632923A5/de not_active IP Right Cessation
-
1979
- 1979-08-16 DE DE2933141A patent/DE2933141C3/de not_active Expired
- 1979-08-16 DE DE19792933174 patent/DE2933174A1/de active Pending
- 1979-09-07 AT AT0591579A patent/AT370989B/de not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4300039C1 (de) * | 1993-01-04 | 1994-06-09 | Imz Fertigung Vertrieb | Befestigungsnagel und Setzwerkzeug hierfür |
Also Published As
Publication number | Publication date |
---|---|
DE2933141A1 (de) | 1980-04-10 |
AT370989B (de) | 1983-05-25 |
ATA591579A (de) | 1982-10-15 |
CH632922A5 (en) | 1982-11-15 |
DE2933174A1 (de) | 1980-04-10 |
CH632923A5 (en) | 1982-11-15 |
DE2933141C3 (de) | 1981-12-17 |
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